Improvement in builders  trestles



Patented June 25,-1872.-

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DAVID L. SMITH, or VIGKSBURG, MISSISSIPPI.

IMPROVEMENT IN BUILDERS TRESTLES.

Specification forming part of Letters Patent No. 128,332, dated June 25,1872.

an improved trestle for the ordinary purposes for which they are nowused, and also for platforms, staging, scaifolding, 850., provided withsuitable clasps or fastenin'gs for the legs and transverse bars, whichshall be so constructed that the said legs or barsmay be convenientlysecured, or taken out and replaced by others longer or shorter, oradjusted so as to stand level upon uneven surfaces; and it consists inthe construction of the various parts of the legs and clasps, ashereinafter more fully described and subsequently pointed out.

Figure 1 is a side view of a single trestle. Fig. 2 is an end view ofthe same; Fig. 3, an end view of a double trestle; Fig. 4, an endelevation of the same.

Similar letters of reference indicate corresponding parts. 1

A is the beam or transverse bar B, the legs, which are secured to beam Aby clasps 0. These clasps are of metal, and consist of two pieces,stamped alike, and secured together by rivets or bolts, as shown at D.The upper part of these clasps is formed to receive a beam of suitablesize, and is securely fastened to it and the legs by wedgeshaped pieces,E,

which are raised or lowered when desired to secure or release the legsby screws F, which pass freely through the wedge-piece but screw solidlyin beam A. These clasps may or may not be provided with teeth andprojections, as shown at G and H, (Figs. 3 and 4,) to guard against thepossibility of their becoming loose from beam or legs.

In practice, the legs required to support the first platform of stagingmay be of any desired length, (say, for example, four feet 5) and if itshould be desired to increase the height to eight feet it is onlynecessary to-place similar trestles upon top of these, with the bottomends of their legs within and extending part way through the outsidepart of clasp, and resting upon the top ends of the legs which supportthe trestles beneath or the screws? may be slackened and the legs uponthe out side of trestles taken out and replaced with legs of the properlength, and upon the top fasten a beam with a clasp, as previouslydescribed and clearly shown in Figs. 3 and 4 of the drawing. This deviceis strong, simple, durable, and cheap.

What I claim as new is- The clasp C, wedge-shaped piece E, and screw F,when combined with beam A and legs B, as herein shown and described, andfor the purposes set forth.

DAVID L. SMITH.

Witnesses Z. S. DEDERIGK, J. P. BAGBY.

